<div dir="ltr">Anders!<br><div><br>Those winds are not nearly enough, to transfer the day heat to the night side or to polar regions. <br><br></div><div>We have about the same high temperature everywhere on Venus all the time, <br>
<br></div><div>As we have about the same temperature everywhere here on Earth, but deep down, Tanks to magma.<br><br></div><div>To transfer the Sun's heat in real time everywhere on the planet, one would need a super-heat-conducter.<br>
<br></div><div>Venus "surface" is in fact deep down in the stuff. Sun has nearly nothing to do with the temperature there, it's geothermic.<br></div><div><br><br></div></div><div class="gmail_extra"><br><br>
<div class="gmail_quote">On Fri, Aug 15, 2014 at 2:16 AM, Anders Sandberg <span dir="ltr"><<a href="mailto:anders@aleph.se" target="_blank">anders@aleph.se</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div><span><span title="protokol2020@gmail.com">Tomaz Kristan</span><span> <<a href="mailto:protokol2020@gmail.com" target="_blank">protokol2020@gmail.com</a>></span></span> , 14/8/2014 2:29 PM:<div class=""><br>
<blockquote style="margin:0 0 0 .8ex;border-left:2px blue solid;padding-left:1ex"><div>My take on this.<div><br></div><div><a href="http://protokol2020.wordpress.com/2014/04/05/venus-debate/" title="http://protokol2020.wordpress.com/2014/04/05/venus-debate/" target="_blank">http://protokol2020.wordpress.com/2014/04/05/venus-debate/</a></div>
</div></blockquote></div></div><div><br></div><div><br></div><div>Measured wind speed profiles look like they have maxima around 60 km height, with 100 m/s velocities. <a href="http://ase.tufts.edu/cosmos/view_picture.asp?id=1103" target="_blank">http://ase.tufts.edu/cosmos/view_picture.asp?id=1103</a></div>
<div>Earth has a maximum around 10 km, with a maximum of a few tens of m/s.</div><div><br></div><div>Venus scale height is 15.9 km, Earth's average 7.64 km. So the Venusian wind maximum is 3.77 scale heights up, while on Earth it is 1.3. At first that seems to suggest that there could not be much transfer since the atmosphere would be pretty attenuated. But remember the 92.1 bar pressure at the surface! exp(-3.77)*92.1=2.1 bar: at this altitude the atmosphere has twice Earth pressure, and it is significantly denser. So the total heat transfer capacity is several times, perhaps an order of magnitude, larger. </div>
<div><br></div><div>The advection timescale (vind velocity / radius) of Earth and Venus are both of the same size, far shorter than the radiative timescales and hence producing a circulation-dominated temperature distribution: <a href="http://www.mi.uni-hamburg.de/uploads/media/6._Planeto_dynamics.pdf" target="_blank">http://www.mi.uni-hamburg.de/uploads/media/6._Planeto_dynamics.pdf</a></div>
<div class=""><div><br></div><div><br><br>Anders Sandberg, Future of Humanity Institute Philosophy Faculty of Oxford University</div></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div dir="ltr"><a href="https://protokol2020.wordpress.com/" target="_blank">https://protokol2020.wordpress.com/</a><br></div>
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